Thread-controlling mechanism for sewing-machines.



L. ONDBRDONK. THREAD CONTROLLING MECHANISM FOR SEWING MACHINES.

- Patented Feb. 23, 1915;

APPLIGATION FILED OCT. 8, 1906. 1. 12958%,

3 SHEETSSHEET 1v L. ONDERDONK. THREAD CONTROLLING MECHANISM FOR SEWING MACHINES. APPLICATION FILED 001". s, 1906.

1 9,560 Patented Feb. 23, 1915.

3 SHEETSSHEET Z.

-L. ONDEBDONK. THREAD (ION-'I'ROLLING MECHANISM FOR SEWING MACHINES.

' APPLICATION FILED OGT. 8, 1906.

3 SHEETS-SHEET s.

Patented Feb. 23, 1915.

LANSING ounnnnonn, or new roan, iv. 2., Ass enon 'ro UNION srncmr. MACHINE com any, or cmcaso, mnmors, A oonronarrou' or rumors.

Specification of Letters ratent.

Patented Feb. 23, 1915.

Application filed October a", 1906, Serial at. 337,991.

To all whom it may concern:

Be it known that I, LANSING Ononnnonn, a citizen of the United States, residing. at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Thread- Controlling Mechanism for Sewing-Machines, of which the following is a description, reference being had to the accompany-- ing drawing and to .the letters and figures of reference marked thereon.

My invention relates to improvements in thread controlling mechanism for sewing machines, and while as to some of its fea-.

tures it may be used for" various purposes, said improvements are more articularly adapted to machines for ma ing' chain stitches.

The object of my invention is to provide a thread controllin mechanism which will care for the slack v ormed'by the looper in both its forward and backward movements. A further object of my invention is to provide a thread controlling mechanism which includes a pull ofli'contro'lled in its movements by the feed of the machine.

These and other objects of the invention will in part be obvious and. in part he more fully explained hereinafter. I

My invention consists in the novel parts, improvements and combinations hereinafter shown anddescribed.

In the accompanying drawings I have illustrated one embodiment of my invention, the same serving, in connection with the dc scription herein to illustrate the principles thereof.

Figure 1 is a front elevation of the lower.

portion of a sewing machine with my improvements applied thereto, being shown in section. Flg. 1s a top plan view of the parts shown in Fig. 1, the bed plate being removed and the feed dog brokenaway to more clearly show the looper and thread controlling transverse sectional elevation of the parts as shown in Fig. 1. Fig. a is a detail perspec-' tive view of my looper mechanism, also showing a portion of the thread controlling mechanism. Fig. 5 is a detail perspective view of the auxiliary thread controller with the thread engaging member in the position it occupies when the looper is at the rear portion of its stroke. Fig. 6 is a detail per certain parts mechanism. I Fig. 3 is a.

spective view similar to that shown in Fig. 5. with the thread engaging member in the. position it occupies when the looper is at the forward end of its stroke. 1

The base plate 1 of the sewing machine is of the ordinary construction and has rising therefrom the overhanging arm 52in which reciprocates a needle bar- 3 carrying needles 4, 4. The presser foot 5 coiiperates'with the feed dog 6 carried'by the feed bar 7 which 1s operated by an eccentric 8 carried by the main shaft 9. These parts are of the usual construction and will not therefore be described in greater detail.

' The looper 10, which cooperates with the needle 4, is carried by the looper carrier 11 which in turn is mounted upon a looper supporting rod 12 carried, in the bearings 13 and 14 supported on the base plate. This loopersupporting rod in the operation of my machine is given anoscillating and also a longitudinal; movement. This, movement of the looper supporting rod causes the looper after it has entered the needle loop to move laterally to position the looper thread loop for the entrance of the needle.

The looper supporting rod 12 is oscillated and moved laterally by the arm '13 which carries at its free end a spherical bearing engaging loosely a stud extending from a collar 14 which is rigidly secured to the looper supporting rod. The swinging arm 13 receives its movement from therock shaft 15' which is mounted in a bearing on the base plate. The arm 16 of said rock shaft is connected by links 17 to the said swinging arm. The rock shaft receives an oscillating movement from the needle lever extension 18 through the link 19.

The thread controlling mechanism for the looper thread comprises a slack thread, controller carried by the lever extension, a pull ofi'member which in the present embodiment of my invention is carried by the feed bar and an auxiliary thread controller intermediate said pull off member and the. main slack thread controller. The main slack thread controller 20 is secured to the lower 7 'ber 23 which is attached to the feed bar at one side and is bent .to extend across the front face of said feed bar where it is slightly deflected in order to form a retaining finger. 24 for the looper thread.

The auxiliary thread controller as shown more clearly in Figs. 5 and 6 is .formed by a member 25 which is secured to the looper supporting rod by means of the collar 14. This member 25 as shown in the drawings is formed from a wire which encircles the set screw 26 which looks the. collar 14 to said looper support. The thread engaging member 25 is bent into the shape of a segment of a circle. This thread member oscillates between the thread guides 27 and 28 which are formed in the thread'guiding wire 29. Said thread guiding wire is secured to the looper supporting bearing 14.

In the operation of my machine, the looper is caused to move forward rapidly to enter the needle loop, reaching the forward end of its stroke substantially at the time the needle is leaving the throat plate of the machine. The looper, through the relation of the operating parts, is caused to dwell at the forward end of its stroke substantially while the needle is reciprocating above the work support. When the looper is moving backward, the needle is descending and con- I sequently the needle lever extension 18, as shown in Fig. 1 is moved to the right, causing the slack thread controller 20 to take up the slack produced in the loo er thread by the backward movement 0 the looper. When, however, the looper is moving forward, the slack thread controller 20 is necessarily moving to the left, as viewed in Fig. 1, thereby giving up slack to the looper. It sometimes occurs in high speed machines that this slack, given up to the looper on its forward movement, is in excess of that re quired by the movements of the looper, and consequently the looper thread whips to the Wrong side of the looper or needle, causing a skipping of stitches. The auxiliary thread controller, is to take care of the slack on the forward movement of the looper, so that the looper thread will be practically held taut during certain portions of both the forward and backward movements of the looper. As the looper moves forward to enter the needle loop, the thread engaging member 25, which is carried by the looper support, engages the looper thread passing through the thread guides 27 and 28, as shown in Fig. 5. A continued movement of the thread engaging member as the loo er moves forward, causes the thread to rule up on the thread engaging wire, as shown in Fig. 6,'thereby taking up the slack that would otherwise be formed in the looper thread. The pull ofl" member 23, receives its movement from the feed bar, and, therefore, when the feed bar is moved to feed ,the fabric, looper ,thread is pulled from the the mam principles of purpose of my messes supply which is used in the formation of the next stitch. It will be noted that when the feed mechanism for the machine is adjusted so as to increase the length of feed that the stroke of the pull off member will be increased and a greater amount of thread drawn ofl. On the other hand, when the feed of the machine is decreased, less thread will be drawn from the supply.

The invention in its broader aspect is not limited to the construction shown; as many changes may be made in the construction set forth in detail, without departing from the invention, and without sacrificing its chief advantages.

Having particularly described my invention, what I claim as new and desire to secure my Letters Patent is:

l. The combination with stitch-forming mechanism including an oscillating threadcarrying looper, of a thread-controlling de vice, means for operating the same for taking up the looper thread on the forward movement of the looper, and a second thread-controlling device, and means for operating the same for taking up the looper thread on the return stroke of the looper.

2. The combination with stitch-forming mechanism including an oscillating threadcarrying looper,of thread-controlling mechanism for the looper thread, comprising a main slack thread controller operatin to take up the slack on the return stroke of the looper, an auxiliary slack thread controller operating to take up the slack in the looper thread on the forward stroke of the looper and a looper thread pull-ofi member operating to pull thread from the supply.

3. The combination with stitch forming mechanism, including an oscillating. thread carrying looper, of thread controlling mechanism therefor, comprising a main slack thread controller,

controller intermediate the main slack thread controller and the looper cooperatingwith said main controller for taking up the slack in the looper thread during both the forward and return strokes of the looper; substantially as described.

4:. The combination with stitch forming mechanism, including a needle lever, a looper and means for operating the same, a looper thread controlling mechanism com prising a main slack thread controller operated by the needle lever and an auxiliary slack thread controller operated by the looper mechanism; substantially as described.

'5. The combination mechanism, including a needle lever, a looper and means for operatin the same, a looper thread controlling mec anism comprising a main slack thread controller operated by the needle lever, and an auxiliary slack thread controller operated by the and an auxiliary thread with stitch forming looper mechanism, and a pull off member for the looper thread; substantially as described.

6. The combination of a stitch forming mechanism including an oscillating looper, a slack thread controller thereto, a feed bar, a thread engaging member operated by said feed bar, and means cooperating therewith to pull off thread corresponding to the movement of the feed bar.

7 The combination of stitch-forming mechanism including a looper, "a loopersupport, means for oscillating the loopersupport about its axis, and for moving the 1 same longitudinally, and a slack thread controller including a thread-engaging member mounted on said looper-support, and having a curved thread-engaging face, and means cooperating with said threadengaging member; substantially as described.

8. The combination of a stitch-forming mechanism including a looper, a looper support, means for oscillating said looper support about its axis and for moving the same longitudinally, and a slack thread controller including a thread engaging member mount ed on said looper support, and stationary thread guides cooperating with said movable thread engaging member; substantially as described.

9. The combination with a stitch forming mechanism, including a looper, and means for oscillating the same, a slack thread controller operated by said looper operating mechanism for controlling the slack in the looper on the forward stroke of the looper, said slack thread controller moving in a plane oblique to the axis of the looper suport.

In testimony whereof I afiix my signature, in presence of two Witnesses.

LANSING ONDERDONK.

Witnesses W. L. SWIFT, C. D. CHURCHILL. 

